Tin is the material that our steam-powered boat is made of. HOW DOES IT WORK? Step 1: Fill the two tubes behind the boat with water using the filler, then position the boat in a tub of water. Step 2: Light the candle and position it underneath the boat's boiler. Adult supervision is needed in this situation. The steam produced by the water in the boat escapes and propels the boat forward using the steam jet effect. The leftover steam condenses and absorbs more water, repeating the cycle until the candle or fire is extinguished. After the candle has burned out, replace it with a wick and oil in the candle holder and try again. With a length of 5.5", the boat is easy to store and transport. The set includes a tin boat, a wax candle holder, and fillets.The toy comes with a tin boat, candle holder with wax and filler. This toy will truly amaze and help kids self discover the science behind it's working.This classic toy comes from 'Desi Toys'.